mattermost.sh

#!/usr/bin/env bash

readonly LOG_TIMESTAMP_FORMAT='+%F %T'

readonly MM_CONFIG=${MM_CONFIG:-/mattermost/config/config.json}
readonly MM_EXEC=${MM_EXEC:-/opt/mattermost/bin/mattermost}


wait_for_db() {
    local db_host_and_port db_host db_port messaged

    db_host_and_port="$(jq -r '.SqlSettings.DataSource' "$MM_CONFIG")" || fail "extracting db data from config file [$MM_CONFIG] failed"
    [[ -z "$db_host_and_port" || "$db_host_and_port" == null ]] && fail "sql connection not set: [$db_host_and_port]"

    # clean the db connection line so we're left w/ "dbhost:port"
    db_host_and_port="${db_host_and_port#*@tcp(}"
    db_host_and_port="${db_host_and_port%%)/*}"

    IFS=':' read -r db_host db_port <<< "$db_host_and_port"
    [[ -n "$db_host" && "$db_port" =~ ^[0-9]+$ ]] || fail "couldn't parse db hostname and/or port: host: [$db_host], port: [$db_port]"

    until nc -z "$db_host" "$db_port"; do
        [[ "$messaged" -ne 1 ]] && echo "Waiting until db @ [$db_host:$db_port] is responding..." && messaged=1
        sleep 2
    done

    log "Connection to db @ [$db_host:$db_port] established"

    return 0
}

# TODO: here trapping is not really necessary as MM is running in foreground via exec
#stop_server() {
    #pgrep -f mattermost | xargs kill
    #exit 0
#}

fail() {
    err "$1"
    exit 1
}


log() {
    local msg
    readonly msg="$1"
    echo -e "[$(date "$LOG_TIMESTAMP_FORMAT")]\tINFO  $msg" | tee -a "$LOG"
    return 0
}


err() {
    local msg
    readonly msg="$1"
    echo -e "\n\n    ERROR: $msg\n\n"  # do not pipe to $LOG
    echo -e "[$(date "$LOG_TIMESTAMP_FORMAT")]\t    ERROR  $msg" | tee -a "$LOG"
}

# ================
# Entry
# ================
#trap stop_server SIGINT SIGTERM  # no need to trap if we're running process via 'exec', right?

[[ -f "$MM_CONFIG" ]] || fail "[$MM_CONFIG] is not a valid file"
[[ "$AUTOSTART" =~ ^[Tt]rue$ && -x "$MM_EXEC" ]] || exit 0

# define logfile:
LOG="$(jq -r '.LogSettings.FileLocation' "$MM_CONFIG")"
[[ $? -ne 0 || -z "$LOG" || "$LOG" == null ]] && LOG=/mattermost/logs
[[ -d "$LOG" ]] || fail "[$LOG] is not a directory (for logs)"
[[ "$LOG" != */ ]] && LOG+='/'; LOG+='stdout.log'


wait_for_db

cd "$(dirname -- "$MM_EXEC")" || fail "unable to cd to mattermost bin location"
sleep 2  # Wait to avoid "panic: Failed to open sql connection pq: the database system is starting up"
log '--> launching mattermost'
exec "$MM_EXEC" >> "$LOG" 2>&1

exit 0